/Engine/Source/Runtime/GeometryFramework/Public/Components/DynamicMeshComponent.h
AutoCalculated Tangent Set, which may require that they be recomputed, or nullptr if not enabled/available
const [UE::Geometry::FMeshTangentsf](API\Runtime\GeometryCore\DynamicMesh\FMeshTangentsf) * GetAutoCalculatedTangents()